Cable Rotation and Twist Pitch Variation for ITER TF Conductor in China

2015 ◽  
Vol 25 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Jing-Gang Qin ◽  
Yu Wu ◽  
Guojun Liao ◽  
Chao Zhou ◽  
Arend Nijhuis ◽  
...  
Keyword(s):  
Twist Pitch

Investigation the Influence of the Nb3Sn Wire Design Parameters and Twist Pitch on Hysteresis Losses

1998 ◽  
pp. 1029-1033 ◽  
Author(s):  
A. D. Nikulin ◽  
A. K. Shikov ◽  
A. E. Vorobieva ◽  
A. G. Silaev ◽  
K. A. Mareev ◽  
...  
Keyword(s):  
Design Parameters ◽  
Hysteresis Losses ◽  
Twist Pitch ◽  
Nb3sn Wire

The Effect of Blade Geometry on Blade Stall Characteristics

2005 ◽  
Vol 127 (4) ◽  
pp. 496-502 ◽  
Author(s):  
R. P. J. O. M. van Rooij ◽  
J. G. Schepers
Keyword(s):  
Correction Term ◽  
Field Tests ◽  
Test Results ◽  
Wind Tunnel Experiments ◽  
Twisted Blade ◽  
The Impact ◽  
2D Airfoil ◽  
Twist Pitch ◽  
Force Characteristics ◽  
Blade Geometry

The effect of rotation has been investigated with emphasis on the impact of blade geometry on the “correction factor” in stall models. The data used came from field tests and wind tunnel experiments performed by the National Renewable Energy Laboratory and were restricted to the steady-state nonyawed conditions. Three blade layouts were available; a blade with constant chord without twist (phase II), a blade with constant chord and twist (phases III and IV), and a tapered blade with twist (phase VI). Effects due to twist and taper were determined from comparison of c n between the different blade layouts. The formulation of the stall model was rewritten so that the measured c n values could be used without reference to 2D airfoil performance. This enabled a direct comparison of the normal force characteristics between the four blade stations of the selected blade configurations. In particular, the correction term f used in stall models for rotational effects was analyzed. The comparison between the test results with a straight and a twisted blade showed that a relation for twist + pitch is required in f . In addition, a dependency offon the angle-of-attack was identified in the measurements and it is recommended that this dependency be incorporated in the stall models.

scholarly journals Performance Study of a Cylindrical Parabolic Concentrating Solar Water Heater with Nail Type Twisted Tape inserts in the Copper Absorber Tube

2017 ◽  
Author(s):  
Amit K. Bhakta ◽  
Nitesh K. Panday ◽  
Shailenrda N. Singh
Keyword(s):  
Solar Energy ◽  
Thermal Performance ◽  
Water Flow Rate ◽  
Twisted Tape ◽  
Solar Water Heater ◽  
Performance Study ◽  
Water Heater ◽  
Solar Water ◽  
Pitch Ratio ◽  
Twist Pitch

This paper reports the overall thermal performance of a cylindrical parabolic concentrating solar water heater (CPCSWH) with inserting nail type twisted tape (NTT) in the copper absorber tube for the nail twist pitch ratios 4.787, 6.914 and 9.042 respectively. The experiments are conducted for a constant volumetric water flow rate and during the time period 9:00 h to 15:00 h. The useful heat gain, hourly solar energy collected and hourly solar energy stored of this solar water heater are found higher for nail twist pitch ratio 4.787. The above said parameters are found to be a peak at noon and observed to follow the path of variation of solar intensity. At the starting of the experiment, the value of charging efficiency is observed to be maximum. Whereas the maximum value of instantaneous efficiency and overall thermal efficiency are observed at noon. The key finding is that the nail twist pitch ratio enhances the overall thermal performance of the CPCSWH.

The Influence of Bending Strain on the Critical Current of ${\rm Nb}_{3}{\rm Sn}$ Strands With Different Filament Twist Pitch

2009 ◽  
Vol 19 (3) ◽  
pp. 2624-2627
Author(s):  
V. Corato ◽  
L. Muzzi ◽  
A. della Corte ◽  
A. Di Zenobio ◽  
S. Turtu ◽  
...  
Keyword(s):  
Critical Current ◽  
Bending Strain ◽  
Twist Pitch

scholarly journals Comparison and Analysis of Twist Pitch Length Test Methods for ITER Nb3Sn and NbTi Strands

2015 ◽  
Vol 44 (9) ◽  
pp. 2095-2099 ◽  
Author(s):  
Liu Fang ◽  
Long Feng ◽  
Gao Huixian ◽  
Chen Chao ◽  
Liu Bo ◽  
...  
Keyword(s):  
Test Methods ◽  
Pitch Length ◽  
Comparison And Analysis ◽  
Twist Pitch

Influence of constructive features of symmetric data transmission chains on the process of optimizing the physical level of infocommunication systems

2018 ◽  
pp. 99-107
Author(s):  
А. B. Semenov ◽  
A. L. Zubilevich ◽  
T. S. Abbasova
Keyword(s):  
Attenuation Coefficient ◽  
Data Transmission ◽  
High Frequency ◽  
Wave Impedance ◽  
Electrical Transmission ◽  
Frequency Model ◽  
Twisted Pair ◽  
Electric Transmission ◽  
Physical Level ◽  
Twist Pitch

The influence of the twisting steps of twisted pairs of horizontal LAN cables of category 6 on the primary and key secondary parameters of the electrical transmission medium of infocommunication systems is investigated. The primary parameters are investigated, which make it possible to determine the secondary parameters of a symmetrical conductive path: wave impedance and attenuation coefficient. It is shown that, with respect to a twisted pair with the smallest twist pitch, it is expedient to apply the high-frequency model to calculate the electric transmission path.

scholarly journals A Method to Estimate the Necessary Twist Pitch in Multi-filamentary Superconductors

2014 ◽  
Vol 507 (2) ◽  
pp. 022016 ◽  
Author(s):  
S Lindau ◽  
N Magnusson ◽  
H Taxt
Keyword(s):  
Twist Pitch

scholarly journals Experimental studies on effect of bonding the twisted tape with pins to the inner surface of the circular tube

2014 ◽  
Vol 18 (4) ◽  
pp. 1273-1283 ◽  
Author(s):  
S. Selvam ◽  
Pr. Thiyagarajan ◽  
S. Suresh
Keyword(s):  
Heat Transfer ◽  
Friction Factor ◽  
Experimental Studies ◽  
Twisted Tape ◽  
Constant Wall Temperature ◽  
Tube Heat Exchanger ◽  
Inner Surface ◽  
Fully Developed Turbulent Flow ◽  
Flow Experiments ◽  
Twist Pitch

Heat transfer and friction factor characteristics are studied for water flowing through the tube in tube heat exchanger for two different configurations, namely,(1) twisted tape with pins (TTP) and (2) twisted tape with pins bonded to the inner surface of the test section (TTPB). Experiments are carried out for different twist pitch to the width of the twisted tape ratios (y/w) for TTP and TTPB. But very few research works have been done based on the above mentioned heat transfer enhancement techniques. This paper presents the effect of twisted tape with pins on the heat transfer for a fully developed turbulent flow. Experiments are conducted by maintaining constant wall temperature. The heat transfer rate and pressure drop is found to be high for TTPB of y/w=3.33 when compared to all other configurations. The empirical correlations developed for different twisted tape with pins results in ?7.28% deviation for Nusselt number and ?7.16% for friction factor.

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